diff --git a/src/expand.rs b/src/expand.rs
index 42e2cd8..3ae9eea 100644
--- a/src/expand.rs
+++ b/src/expand.rs
@@ -398,7 +398,8 @@ fn has_bound(supertraits: &Supertraits, marker: &Ident) -> bool {
         if let TypeParamBound::Trait(bound) = bound {
             if bound.path.is_ident(marker)
                 || bound.path.segments.len() == 3
-                    && bound.path.segments[0].ident == "core"
+                    && (bound.path.segments[0].ident == "std"
+                        || bound.path.segments[0].ident == "core")
                     && bound.path.segments[1].ident == "marker"
                     && bound.path.segments[2].ident == *marker
             {